スケジュール 0 16:15 〜 16:30 [LEDIA4-03] Correlation between Etch Pit Size and Threading Dislocation Propagation Habit in GaN Substrate Observed by Multiphoton-Excitation Photoluminescence *Mayuko Tsukakoshi1, Tomoyuki Tanikawa1, Masahiro Uemukai1, Ryuji Katayama1 (1. Osaka University)